Re: Couple of questions!!

Depends on how much you work the decks. They're belt driver so they won't take a battering.

Your mixer will be compatible with new decks. All decks and mixers are connected by the same cables.

I don't know about your amp. If its working, its working. You need to have a level high enough that you're not going into the red on the mixer - coz you'll get distortion. Same with going into the red on the amp.